194 • 4-Series™ Control Systems Product Manual — Doc. 8559B
Primary-Subordinate Mode
Primary-subordinate mode is a network configuration that allows a 4-Series control system to
access ports on other Crestron control systems over Ethernet. By attaching a subordinate
control system to a primary control system, the primary control system can use ports that it may
not normally have (I/O, IR, RF, and so forth).
In a primary-subordinate environment, the primary control system contains the program that
controls all Cresnet and Ethernet devices attached to it. The subordinate control system turns
off its processing capabilities and behaves like any other Cresnet or Ethernet device. The
subordinate control system obeys the program running on the primary control system, making
its ports available to the primary for control. Only one primary program needs to be written to
control multiple subordinate systems.
NOTE: If a control system must communicate with other control systems while running its
own program, use the "Intersystem Communications" symbol for peer-to-peer
communications between control systems over Ethernet. For more information, refer to the
SIMPL or SIMPL# Pro help files.
Definitions
Depending on the communications capabilities of a control system, it may function as a Cresnet
primary, an Ethernet primary, or an Ethernet subordinate.
NOTE: A4-Series control system can be a subordinate to a 3-Series or 4-Series control
system. A 4-Series control system cannot be a subordinate to a 2-Series control system.
Cresnet Primary
When the control system is in Cresnet primary mode (the default mode for 4-Series control
systems), it can control Cresnet and Ethernet devices as well as 2-Series control systems
operating in the Cresnet subordinate mode. Control systems can function as a Cresnet primary
and an Ethernet primary simultaneously.
Ethernet Primary
When the control system is in Ethernet primary mode, it can control Ethernet and Cresnet
devices as well as 2-Series, 3-Series, and 4-Series control systems operating in the Ethernet
subordinate mode.
Control systems can function as an Ethernet primary and a Cresnet primary simultaneously.
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